The elbows in the front view need some adjustment.
Right now you flare the forearms out symmetrically at the elbow. This gives the forearm a wooden mannequinn aspect.
You should flare the inner part of the elbow pretty much where it is. A bunch of flexors originate at the medial epicondyle of the humerus.
HOWEVER…
http://www.daanspanjersberg.nl/site/16632/spiergroepen/photo25.jpg
You should push the outer flare of the forearm UP so that it is ABOVE the elbow. Muscles like the brachioradialis originate above the epicondyles, actually on the humerus itself.
It looks like you’ve eased this correction into the latest drawings without mentioning it, but you are doing it more with one arm than with the other. I’d suggest ghosting in an axis where you think the elbow bend actually would occur, and make sure the muscle masses sit outside/high inside/low with respect to that axis.